fix: resolve CI failures in Python tests and admin-compliance build

Python: add missing 'import enum' to compliance/db/models.py shim.
TypeScript: remove duplicate export of useVendorCompliance from
  vendor-compliance/context.tsx (already exported from ./hooks).
Docs: add mandatory pre-push checklist (lint + test + build) to
  AGENTS.python.md and AGENTS.go.md. [guardrail-change]

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

AGENTS.go.md

@@ -143,6 +143,26 @@ Domain errors are defined in `internal/domain/<aggregate>/errors.go` as sentinel
 - Pass `ctx` everywhere. Cancellation respected.
 - No global mutexes for request data. Use per-request context.
 
+## Before every push — MANDATORY
+
+Run all steps for `ai-compliance-sdk/` before pushing. CI runs the same checks and will fail if you skip this.
+
+```bash
+cd ai-compliance-sdk
+
+# 1. Vet + lint
+go vet ./...
+golangci-lint run --timeout 5m ./...
+
+# 2. Tests
+go test ./...
+
+# 3. Build
+go build ./...
+```
+
+All steps must exit 0. Do not push if any step fails.
+
 ## What you may NOT do
 
 - Touch DB schema/migrations.